We propose a novel approach to compute the cross section of near-threshold J/ψ and Υ production in electron-proton scattering at large photon virtualities Q2 based on an operator product expansion. We show that the process can be used to extract the gluon part of the D-term gravitational form factor of the proton. At the subleading level, it is also sensitive to the trace anomaly effect of QCD.
@article{arxiv.2004.12715,
title = {A QCD analysis of near-threshold quarkonium leptoproduction at large photon virtualities},
author = {Renaud Boussarie and Yoshitaka Hatta},
journal= {arXiv preprint arXiv:2004.12715},
year = {2020}
}